GRAND RAPIDS (WZZM) -- No one is breathing a sigh of relief just yet, but the threat of the Grand River overtaking the Grand Rapids Wastewater Plant has gone down a bit.

Volunteers and city workers have been filling sandbags non-stop since Thursday to add to the wall around the sewage plant. The geography of Market Street is especially vulnerable because the land dips into a bowl shape.

Mayor George Heartwell says even though the predicted crest of the Grand River has gone down slightly, the city is still taking every precaution possible to make sewage doesn't pour into the river.

"Whatever we have to do today to go over and above, we're doing it to protect that plant. We've moved some equipment; Three million dollars worth of equipment that's been relocated out of that plant that isn't necessary immediately to the processing of the waste water that can be moved to higher ground," said Heartwell.

Market Ave is now closed to allow workers and volunteers more room to build up a barrier.